Baking

Bread Hydration Calculator

Bakers don't write recipes in cups — they write in baker's percentages where flour is always 100% and every other ingredient is expressed as a percentage of the flour weight. Hydration (water as a percent of flour weight) is the single most important variable: a 60% hydration dough is stiff bagel territory; an 85% dough is sticky ciabatta territory you almost can't handle without flour-dusted hands. This calculator computes hydration from your flour + water + salt amounts (in grams), gives you the salt percentage, total dough weight, and tells you what bread style your dough lands in.

Hydration %

—

Salt %: —
Total dough: —
Bread style: —

The baker's percent system

Every ingredient gets expressed as a percentage of total flour weight. Flour is, by definition, 100%. Water at 70% means: 70 g water for every 100 g flour. Salt at 2% means: 2 g salt for every 100 g flour.

Why this system: it scales perfectly. If you want twice as much bread, multiply every gram by 2. If you want to convert someone's recipe from "3 cups flour" to weights, look up the flour's density and convert; the percentages stay constant. Professional bakeries run on baker's percent because it makes batch sizing trivial.

Worked example: 500g flour, 350g water, 10g salt, 5g yeast. Hydration = 350/500 = 70%. Salt = 10/500 = 2%. Yeast = 5/500 = 1%. Total dough = 865g.

Hydration ranges by bread style

50-58%: Bagels, pretzels — stiff, hand-shaped, hold their shape on the boil
58-65%: Sandwich loaves, dinner rolls — easy to handle, tight crumb
65-72%: Country loaves, baguettes — open crumb, manageable but soft
72-78%: Sourdough boules, rustic loaves — high hydration for big holes
78-85%: Ciabatta, focaccia — wet, sticky, scoopable rather than knead-able
85%+: High-hydration sourdough, focaccia, pizza Romana — advanced handling, no-knead methods (autolyse + folds)

Higher hydration = more open crumb (big holes), longer shelf life, but harder to shape and harder to control. Start at 65-70% for beginners; work up to 75-80% as you master folding techniques.

How to use this calculator

Flour in grams — weigh on a kitchen scale.
Water in grams (1 mL = 1 g for kitchen purposes).
Salt in grams.
Output: hydration %, salt %, total dough weight, suggested bread style.
Working backward: pick a target hydration (say 72%), pick a flour amount (500g), water = 500 × 0.72 = 360g, salt = 500 × 0.02 = 10g. Enter those values to verify.

Common scenarios

Standard sandwich loaf, 500g flour at 65%. 325g water, 10g salt, 5-7g instant yeast. Easy first bread for beginners — firm enough to knead, soft enough for nice rise. Makes about 1 medium loaf.

Rustic country bread, 800g flour at 75%. 600g water, 16g salt, 4g instant yeast or 160g sourdough starter at 100% hydration (subtract starter water from total). Bulk ferment 4-6 hours with 3-4 folds, shape, cold retard overnight, bake at 475°F in a Dutch oven.

Focaccia, 500g flour at 82%. 410g water, 12g salt, 4g yeast. Dump and stretch-fold every 30 min for 3-4 folds, oil a sheet pan generously, drape dough in, dimple with fingers, top with rosemary/olives/onions, bake at 450°F. Wet dough = big bubbles + crispy bottom.

FAQ

What's the salt percentage — is 2% standard? +

Yes, 2% is the standard for most lean doughs. Salt below 1.5% tastes flat; above 2.5% slows fermentation noticeably. Enriched doughs (brioche, challah) sometimes use 1.5% because the other flavors carry. Sourdough at 2-2.2%.

Why use weight instead of volume? +

Flour packs differently every scoop — a "cup" of flour can range 120-160g depending on how packed. Weighing eliminates the variance. Once you're using grams, the math also gets easier (everything scales linearly). All serious bread recipes use grams; serious home bakers use a $20 kitchen scale.

Does humidity affect hydration? +

Yes. Whole-wheat and high-protein flour absorb more water than white bread flour. In humid weather, flour is already a bit wet and you may need slightly less water. Most recipes account for this by saying "add water as needed" — the dough's feel matters more than the exact gram count.

What about flour types — do they hydrate differently? +

Yes. Bread flour (12-14% protein) holds water well at 70-75% hydration. All-purpose (10-11.5%) maxes out around 70%. Whole wheat absorbs 5-10% more water than white flour. Rye absorbs differently still and needs warm water. Always adjust hydration based on the actual flour you're using.

Why does the calculator suggest different bread styles based on hydration? +

It's a quick orientation check: if you mixed something at 84% hydration but thought you were making a sandwich loaf, the calculator flags that you're closer to ciabatta territory and the dough handling will be very different. Hydration is one of the biggest factors in what kind of bread you end up with.

What about sourdough — how does starter factor in? +

Sourdough starter at 100% hydration is 50% flour, 50% water by weight. If a recipe calls for 200g of starter, that's 100g flour + 100g water that count toward total dough flour and water. Calculate overall hydration including the starter's contribution. The recipe's stated "hydration" should be overall hydration (some recipes confuse "dough hydration" vs "total hydration").

What if my dough feels too wet for the stated hydration? +

Either you under-weighed flour, over-weighed water, used a low-protein flour, or your kitchen is humid. Sprinkle a small amount of flour during folds (10-20g) to bring the feel back to where you want it. Don't fight the dough — high-hydration dough needs different handling (folds instead of kneading, wet hands, plenty of bench flour).

Can I include preferment (poolish, biga) in the hydration math? +

Yes — add the flour and water from the preferment to the totals before calculating hydration. A poolish at 100% hydration contributes equal parts flour and water to the total dough math. The final dough's hydration includes everything mixed together at the final mix.